单词	crown gall
释义	crown gall noun : a disease that affects many species of plants and is caused by a bacterium (Agrobacterium tumefaciens) which forms tumorous enlargements usually just below the ground on the stem Example Sentences Recent Examples on the Web Plants can also get cancer, like the tree tumor known as a crown gall. New York Times, 25 May 2022 The tumorlike growths at the base of the trunk and on the rootball appear to be crown gall, Agrobacterium tumefaciens. oregonlive, 13 Mar. 2022 Common pests & diseases Black spot and powdery mildew are common fungal diseases, while crown gall disease may occur less commonly. Earl Nickel, SFChronicle.com, 7 Aug. 2020 Word History First Known Use 1894, in the meaning defined above
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